Voltage not Fixed?

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Danny111

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Sep 8, 2013
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So I have a new i5-4670k and tried to OC it. First did the ASRock own 4.0GHz overclock thing (you don't change the settings yourself it does it for you apparently you just select 4.0 or 4.2 or 4.4 at the top and all the settings below I guess are automaticall changed). At 4.0GHz it seemed fine, temperatures max mid 70s but mostly between 60-70 (one core seemed to be lower than the others at 58 even?) but even there the voltage according to CPUID HWM was 1.26V.

So next I went into BIOS again and myself chose this time 42 multiplier and 1.900V fixed. But I run PRIME95 again check CPUID and it says 1.267V - I don't understand I chose fixed voltage how can it go up on its own? I cut the test short, 4 passes no errors, but the temperatures went up to 80 and at highest even mid 80s, didn't like that.

How come the voltage does not stay at 1.9V as I set it?
 
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Kelthar

Kelthar

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Mar 27, 2013
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You are mixing voltages.

CPU Voltage and CPU Input Voltage are two different things. If you had set VCore to 1.9 your CPU would've probably got burnt to a crisp.

What you set to 1.9 was most likely the Input voltage. If it was vcore, then you should definitely read a guide on overclocking because you almost ruined your CPU and possibly the motherboard.
 
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mr1hm

mr1hm

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1.900v is WAY over the limit. it's most likely that the BIOS isn't accepting the change because it'll kill your CPU.

the slight rise of CPU voltage from 1.26v to 1.267v is probably because of load-line calibration which will either reduce your voltages under load and raise voltages when idle (or vice versa).
you need to check and make sure which LLC setting will get you the voltage closest to the specified voltage in the BIOS.

as temps being different on each core, this is normal starting from 3rd gen intel CPUs. since the IHS (pretty much the lid that was attached and glued to the top of the CPU) isn't soldered, the heat distribution can become uneven over the IHS causing certain cores to be higher or lower in temperature.

which ASRock motherboard model are you using? i cant speak much for ASRock because it always seemed to be slightly unstable when overclocking a while ago on my ASRock Z77 Extreme4. also, that specific motherboard showed/reported incorrect voltages. however, im not sure if they improved their motherboards for the Z87 chipset.
 
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Danny111

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No, well the mainboard doesn't even let me set VCore that high so it's all good.

And I will, but the thing is the BIOS I have is not the same as older versions and I haven't found a guide to it yet. Because the labels it has, are way off to the ones in guides that are out there.

I just reset everything (I checked the defaults are all "auto" except input voltage is fixed at 1.9V) for now but took the multiplier to 40 from 34. Now the max is 1.199V.

I managed to get 4.2 stable at fixed 1.20V but I'd rather prefer variable so that when the CPU isn't under load it goes down. But so far if I choose that (called adaptive apparently in the BIOS) the voltage goes crazy.

I can see what is going on using the ASRock A-Tuning software. It is now at 1.199V because for "CPU Voltage Mode" adaptive is selected with "CPU Adaptive Voltage" at 1.200V and 0V "CPU Voltage Offset". I changed LLC to level 3 and now I guess it brings me 0.001 below what it should be. So I assume when it went to 1.28 from 1.2 I had "CPU Voltage Offset" at 0.08 or something and LLC level 2 that I had wasn't as good as 3.

The problem is, I have no idea how to set these options in the UEFI because they are not called the same as in this A-Tuning software, and I really don't want to load that programme at the start all the time and set the stuff I want.
 
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Danny111

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Yes now it is at 3 not 2 and it is 0.001V off rather than 0.007V.



Z87 Extreme4

As I said above, looking at the A-Tuning software I think I know what is going on, but since those labels are not the same as in the UEFI, I'm going to wait til I find a video for that specific UEFI.
 
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